CN113927722B - Complete equipment for mechanized flow production of small-sized concrete prefabricated parts - Google Patents
Complete equipment for mechanized flow production of small-sized concrete prefabricated parts Download PDFInfo
- Publication number
- CN113927722B CN113927722B CN202111423076.1A CN202111423076A CN113927722B CN 113927722 B CN113927722 B CN 113927722B CN 202111423076 A CN202111423076 A CN 202111423076A CN 113927722 B CN113927722 B CN 113927722B
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- movable
- concrete
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- pouring
- bracket
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 25
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 26
- 239000010959 steel Substances 0.000 claims abstract description 26
- 238000003860 storage Methods 0.000 claims abstract description 23
- 239000007921 spray Substances 0.000 claims abstract description 17
- 238000005096 rolling process Methods 0.000 claims abstract description 16
- 238000004140 cleaning Methods 0.000 claims abstract description 15
- 239000000428 dust Substances 0.000 claims description 34
- 239000000725 suspension Substances 0.000 claims description 11
- 238000009417 prefabrication Methods 0.000 claims description 6
- 125000006850 spacer group Chemical group 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 16
- 238000003912 environmental pollution Methods 0.000 abstract description 4
- 231100000206 health hazard Toxicity 0.000 abstract description 3
- 238000003908 quality control method Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000003795 chemical substances by application Substances 0.000 description 6
- 238000005266 casting Methods 0.000 description 2
- 238000010422 painting Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B15/00—General arrangement or layout of plant ; Industrial outlines or plant installations
- B28B15/007—Plant with two or more identical shaping or moulding devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/08—Producing shaped prefabricated articles from the material by vibrating or jolting
- B28B1/087—Producing shaped prefabricated articles from the material by vibrating or jolting by means acting on the mould ; Fixation thereof to the mould
- B28B1/0873—Producing shaped prefabricated articles from the material by vibrating or jolting by means acting on the mould ; Fixation thereof to the mould the mould being placed on vibrating or jolting supports, e.g. moulding tables
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B17/00—Details of, or accessories for, apparatus for shaping the material; Auxiliary measures taken in connection with such shaping
- B28B17/04—Exhausting or laying dust
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
The invention relates to the field of production and construction of small-sized concrete prefabricated parts, in particular to a small-sized concrete prefabricated part mechanized flow production and construction device; the device comprises a die unit, a movable cleaning unit, a vibrating unit and a concrete pouring unit, wherein the die unit consists of a plurality of prefabricated member dies, the movable cleaning unit comprises a multifunctional trolley, a movable electric rolling brush, a movable high-pressure spray head and an electric winch, the vibrating unit comprises a steel plate platform, an attached vibrating block and a movable bracket, and the concrete pouring unit comprises a pouring device bracket, a concrete temporary storage bin and a concrete pouring hose; the invention achieves the beneficial effects of improving production and construction efficiency, reducing construction cost, improving production quality control of prefabricated parts and avoiding environmental pollution and occupational health hazard in the production process through mechanized flow production and construction of small prefabricated parts.
Description
Technical Field
The invention relates to the field of production and construction of small-sized concrete prefabricated parts, in particular to a complete equipment for mechanized flow production of the small-sized concrete prefabricated parts.
Background
The conventional construction process of the small concrete prefabricated part mostly adopts manual cleaning treatment on the mould, the cleaning efficiency is low, dust emission phenomenon can occur in cleaning, and the damage is caused to the environment and the occupational health of operators; the release agent is manually painted on the mould, the painting efficiency is low, the painting uniformity is difficult to ensure, and the conditions of inconsistent surface color of the prefabricated member after demoulding, sticking of the mould to concrete and the like are easily caused; commercial concrete pouring is adopted, and because the concrete consumption of each prefabricated member is small, manual pouring is mostly adopted, the pouring efficiency is low, the material loss is large, the production time is long, and the concrete quality is difficult to guarantee; the vibration is performed by using a manual hand-held vibrating rod or a plate-type vibrator, and the vibration effect is difficult to control; the small-sized machine tool is adopted for lifting and moving, and the construction efficiency is low.
Disclosure of Invention
The invention aims to solve the problems, thereby providing a small-sized concrete prefabricated member mechanized flow production complete equipment.
The invention solves the problems, and adopts the following technical scheme:
The small-sized concrete prefabricated member mechanized flow production complete equipment comprises a mould unit, a movable cleaning unit, a vibrating unit and a concrete pouring unit, wherein the mould unit comprises a plurality of prefabricated member moulds; the movable cleaning unit comprises a multifunctional trolley, a movable electric rolling brush, a movable high-pressure spray head and an electric winch, and the movable electric rolling brush, the movable high-pressure spray head and the electric winch are arranged at the top of the multifunctional trolley bracket; the vibrating unit comprises a steel plate platform, an attached vibrating block and a movable bracket, wherein the steel plate platform is supported by the movable bracket under the platform, and the attached vibrating block is arranged on the bottom surface of the steel plate platform; the concrete pouring unit comprises a pouring device support, a temporary concrete storage bin and a concrete pouring hose, wherein the concrete pouring unit is arranged above the vibrating unit, the pouring device support is supported on the ground on two sides of the vibrating unit, the temporary concrete storage bin is arranged on the top surface of the pouring device support, and a discharge hole of the temporary concrete storage bin is connected with the concrete pouring hose.
Compared with the prior art, the invention adopting the technical scheme has the outstanding characteristics that:
① Realizing the mechanized flow production construction of small prefabricated parts;
② The production and construction efficiency is improved;
③ The construction cost is reduced;
④ The production quality control of the prefabricated part is improved;
⑤ Preventing environmental pollution and occupational health hazard in the production process.
Preferably, the invention further adopts the technical scheme that:
the die unit also comprises a bracket and suspension shafts, the prefabricated part dies are orderly arranged and embedded into the bracket, and more than two groups of suspension shafts are respectively arranged on the left side and the right side outside the bracket.
The top of the multifunctional trolley support is provided with longitudinal rail beams with the same number as that of prefabricated member molds, each longitudinal rail beam is respectively provided with a movable electric rolling brush and a movable high-pressure spray head, the lower surface of the top of the multifunctional trolley support is suspended with dust hoods with the same number as that of the prefabricated member molds, dust collection pipelines are arranged in the dust hoods and are connected with dust collectors and dust collection bins, the multifunctional trolley top support is provided with electric windlass with the same number as that of suspension shafts, the electric windlass is connected with a hook, a separating agent storage bin, the dust collectors and the dust collection bins are suspended behind the multifunctional trolley, and a storage battery group is suspended in front of the multifunctional trolley, and the multifunctional trolley driving wheels, the movable electric rolling brush, the movable high-pressure spray heads, the dust collectors and the electric windlass are driven by the storage battery group.
The vibrating unit adopts an underground embedded structure, the top surface of the steel plate platform is flat with the ground, a plurality of movable brackets are uniformly distributed under the steel plate platform, and an attached vibrating block is arranged at the position, corresponding to the center of each prefabricated part die, of the bottom surface of the steel plate platform.
Two groups of spiral gauges are arranged below a discharge hole of a temporary concrete storage bin of the concrete pouring unit, the tail ends of the spiral gauges are connected with a concrete pouring hose, and the tail ends of the concrete pouring hose are fixed on a pouring device bracket by adopting a pouring tube moving hanger.
Drawings
FIG. 1 is a plan view of a mold unit according to an embodiment of the present invention;
FIG. 2 is a side view of a mold unit according to an embodiment of the invention;
FIG. 3 is an elevation view of a mobile cleaning unit according to an embodiment of the present invention;
FIG. 4 is an elevation view of a vibrating unit according to an embodiment of the present invention;
FIG. 5 is an elevation view of a concrete placement unit according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of the combined construction of the vibrating units of the concrete pouring unit according to the embodiment of the invention;
In the figure: a preform mold 1; a bracket 2; a suspension shaft 3; a running wheel 4; a multifunctional trolley bracket 5; a movable electric rolling brush 6; a mobile high pressure spray head 7; a dust hood 8; a longitudinal rail beam 9; an electric hoist 10; a hook 11; a battery pack 12; a release agent storage bin 13; a dust catcher and dust catcher bin 14; a steel plate platform 15; attached vibrating block 16; a movable bracket 17; a casting holder 18; a temporary concrete storage bin 19; a screw gauge 20; a concrete pouring hose 21; the casting tube moves the hanger 22.
The specific embodiment is as follows:
The invention is further described below in connection with the following examples which are provided for the purpose of better understanding of the present invention and are, therefore, not to be construed as limiting the scope of the invention.
Referring to fig. 1-6, a small-sized concrete prefabricated member mechanized flow production complete equipment comprises a mould unit, a movable cleaning unit, a vibrating unit and a concrete pouring unit, wherein the mould unit comprises a plurality of prefabricated member moulds 1; the movable cleaning unit comprises a multifunctional trolley, a movable electric rolling brush 6, a movable high-pressure spray head 7 and an electric winch 10, wherein the movable electric rolling brush 6, the movable high-pressure spray head 7 and the electric winch 10 are arranged at the top of the multifunctional trolley bracket 5; the vibrating unit comprises a steel plate platform 15, an attached vibrating block 16 and a movable bracket 17, wherein the steel plate platform 15 is supported by the movable bracket 17 under the platform, and the attached vibrating block 16 is arranged on the bottom surface of the steel plate platform 15; the concrete pouring unit comprises a pouring device support 18, a temporary concrete storage bin 19 and a concrete pouring hose 21, wherein the concrete pouring unit is arranged above the vibrating unit, the pouring device support 18 is supported on the ground on two sides of the vibrating unit, the temporary concrete storage bin 19 is arranged on the top surface of the pouring device support 19, and a discharge hole of the temporary concrete storage bin 19 is connected with the concrete pouring hose 21.
In the embodiment, the prefabrication construction of the cable trench cover plate in the tunnel is taken as an example, the die unit is composed of a prefabrication die 1, a bracket 2 and a suspension shaft 3, the length and width total size of the die unit is controlled within 2.5 meters, the thickness of the die unit is designed according to the thickness of the prefabrication die 1, eight prefabrication dies 1 are orderly arranged in two rows and four columns to be embedded into the bracket 2, three groups of suspension shafts 3 are arranged outside the bracket 2 to be fixedly connected with the bracket 2 into a whole, the size of the cover plate is 0.5-0.1 meter, the die unit is composed of three groups of transverse steel quilting frames of 2.5-0.1 meter, five groups of longitudinal steel quilting frames of 2.3-0.1 meter and three groups of six suspension shafts 3 to form a bracket bearing system, and eight groups of prefabrication dies 1 are embedded inside.
The movable cleaning unit consists of a multifunctional trolley, a movable electric rolling brush 6, a movable high-pressure spray head 7 and an electric winch 10, wherein the multifunctional trolley adopts a battery pack 12 to provide power, a multifunctional trolley support 5 is internally hollowed out, the hollowed-out size is 2.6 x 0.7 m, the multifunctional trolley support is formed by combining profile steel frameworks, and three groups of driving wheels 4 are arranged below the multifunctional trolley support 5 and driven by the battery pack 12; the top of the multifunctional trolley bracket 5 is respectively provided with a cross beam and four groups of eight longitudinal track beams 9 according to the arrangement mode of the prefabricated member mould 1 of the mould unit, the longitudinal track beams 9 are positioned at the central line of the prefabricated member mould 1, four groups of eight sets of movable electric rolling brushes 6 and four groups of eight sets of movable high-pressure spray heads 7 are arranged on the longitudinal track beams 9, and all the four groups of movable high-pressure spray heads are driven by battery packs 12; eight sets of movable electric rolling brushes are wrapped by eight sets of dust hoods 8, the size of each dust hood 8 is 0.5 x 1 x 0.2 m, the dust hoods 8 are hung below the multifunctional trolley bracket 5 and correspond to the prefabricated part molds 1 one by one, a dust collection pipeline is arranged in each dust hood 8 and is connected with a dust collector and a dust collection bin 14, and the dust collectors are driven by a battery pack 12; three groups of six electric windlass 10 are arranged at the top of the multifunctional trolley bracket 5, the electric windlass 10 is connected with a hook 11, and the electric windlass 10 is driven by a battery pack 12; the front of the multifunctional trolley is suspended with a battery pack 12, and the rear is suspended with a separating agent storage bin 13 and a dust remover and dust removal bin 14.
The vibrating unit consists of a steel plate platform 15, an attached vibrating block 16 and a movable bracket 17, adopts an underground embedded structure, adopts hardening treatment in an operation area, and adopts concrete hardening treatment in a device foundation pit size of 3.1 x 0.4 m; a steel plate with the length of 3-0.03 m is used as a working platform, three groups of nine movable brackets 18 are arranged below the steel plate platform 15 for supporting, and the movable brackets 18 are adjusted until the top surface of the steel plate plane 15 is level with the ground; eight attached vibrating blocks 16 are arranged below the steel plate platform 15 and correspond to the center position below the 8 prefabricated member molds 1.
The concrete pouring unit consists of a pouring device bracket 18, a concrete temporary storage bin 19, a screw counter 20, a concrete pouring hose 21 and a pouring pipe movable hanger 22, wherein the concrete pouring unit is built above the vibrating unit, the pouring device bracket 18 is supported on the ground on two sides of the vibrating unit by adopting a steel skeleton, the height of the pouring device bracket 18 is 1.5 m, and the concrete temporary storage bin 19 is arranged on the top surface of the pouring device bracket 18; two sets of screw meters 20 are arranged below the discharge hole of the concrete temporary storage bin 19; the tail end of the screw gauge 20 is connected with a concrete pouring hose 21; the tail end of the concrete pouring hose 21 is fixed on the pouring device bracket 18 by a pouring tube moving hanger 22, so that the moving function is realized.
Starting a multifunctional trolley, driving the multifunctional trolley to the position above the die unit, putting down a hook 11, and hanging the die unit by adopting an electric winch 10 after the hook 11 is connected with the die unit suspension shaft 3 and tightly contacting with a dust hood 8; starting dust removing equipment, starting a movable electric rolling brush 6 to clean the prefabricated part mould 1, starting a movable high-pressure spray head 7 to spray a separating agent into the prefabricated part mould 1 after cleaning is finished, and performing cleaning and spraying the separating agent in a dust hood 8 to prevent environmental pollution; then lifting the die unit to the vibrating unit by utilizing the multifunctional trolley, removing the hook 11, putting down the die unit, and enabling the multifunctional trolley to leave the pouring area; after the concrete arrives at the site, the concrete is unloaded into a concrete temporary storage bin 19 at the top of the concrete pouring unit, a pouring pipe moving hanger 22 is started to move a concrete pouring hose 21 to the position above the prefabricated part mould 1, a screw gauge 20 is started to convey the concrete into the prefabricated part mould 1 through the concrete pouring hose 21 according to the calculated dosage of each prefabricated part for pouring, and the concrete pouring hose 21 is lifted after the pouring is finished; starting a vibrating unit; and after the vibration is finished, starting the multifunctional trolley to hoist the die unit to a curing area.
The embodiment of the invention achieves the beneficial effects of improving the production construction efficiency, reducing the construction cost, improving the production quality control of the prefabricated parts and avoiding environmental pollution and occupational health hazard in the production process through the mechanized flow production construction of the small prefabricated parts.
The foregoing description of the preferred embodiments of the invention is not intended to limit the scope of the claims, but rather to cover all equivalent modifications within the scope of the present invention as defined by the appended claims.
Claims (3)
1. A small-size concrete prefabrication piece mechanized flow production complete sets, its characterized in that: the device comprises a mould unit, a movable cleaning unit, a vibrating unit and a concrete pouring unit, wherein the mould unit comprises a plurality of prefabricated part moulds (1); the movable cleaning unit comprises a multifunctional trolley, a movable electric rolling brush (6), a movable high-pressure spray head (7) and an electric winch (10), wherein the movable electric rolling brush (6), the movable high-pressure spray head (7) and the electric winch (10) are arranged at the top of the multifunctional trolley bracket (5); the vibrating unit comprises a steel plate platform (15), an attached vibrating block (16) and a movable support (17), wherein the steel plate platform (15) is supported by the movable support (17) under the platform, and the attached vibrating block (16) is arranged on the bottom surface of the steel plate platform (15); the concrete pouring unit comprises a pouring device bracket (18), a temporary concrete storage bin (19) and a concrete pouring hose (21), wherein the concrete pouring unit is arranged above the vibrating unit, the pouring device bracket (18) is supported on the ground at two sides of the vibrating unit, the temporary concrete storage bin (19) is arranged on the top surface of the pouring device bracket (18), and a discharge hole of the temporary concrete storage bin (19) is connected with the concrete pouring hose (21);
The die unit further comprises a bracket (2) and suspension shafts (3), the plurality of prefabricated part dies (1) are orderly arranged and embedded into the bracket (2), and more than two groups of suspension shafts (3) are respectively arranged at the left side and the right side outside the bracket (2);
The top of the multifunctional trolley support (5) is provided with longitudinal track beams (9) the number of which is consistent with that of prefabricated member dies (1), each longitudinal track beam (9) is provided with a movable electric rolling brush (6) and a movable high-pressure spray head (7) respectively, the lower surface of the top of the multifunctional trolley support (5) is suspended with dust hoods (8) the number of which is consistent with that of the prefabricated member dies (1), dust removal pipelines are arranged in the dust hoods (8), the dust removal pipelines are connected with dust collectors and dust removal bins (14), the multifunctional trolley support (5) is provided with electric windlass (10) the number of which is consistent with that of suspension shafts (3), the electric windlass (10) is connected with a hook (11), a spacer storage bin (13), a dust collector and a dust removal bin (14) are suspended at the rear of the multifunctional trolley, a battery pack (12) is suspended in front of the multifunctional trolley, and the multifunctional trolley driving wheels (4), the movable electric rolling brush (6), the movable high-pressure spray heads (7), the dust collectors and the electric windlass (10) are driven by the battery pack (12).
2. The small concrete prefabricated member mechanized flow production complete equipment according to claim 1, wherein: the vibrating unit adopts an underground embedded structure, the top surface of the steel plate platform (15) is flat with the ground, a plurality of movable brackets (17) are uniformly distributed under the steel plate platform (15), and an attached vibrating block (16) is arranged at the corresponding position of the bottom surface of the steel plate platform (15) and the center of each prefabricated member mould (1).
3. The small concrete prefabricated member mechanized flow production complete equipment according to claim 1, wherein: two sets of spiral metering devices (20) are arranged below a discharge hole of a concrete temporary storage bin (19) of the concrete pouring unit, the tail ends of the spiral metering devices (20) are connected with a concrete pouring hose (21), and the tail ends of the concrete pouring hoses (21) are fixed on a pouring device bracket (18) by adopting a pouring tube movable hanger (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111423076.1A CN113927722B (en) | 2021-11-26 | 2021-11-26 | Complete equipment for mechanized flow production of small-sized concrete prefabricated parts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111423076.1A CN113927722B (en) | 2021-11-26 | 2021-11-26 | Complete equipment for mechanized flow production of small-sized concrete prefabricated parts |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113927722A CN113927722A (en) | 2022-01-14 |
| CN113927722B true CN113927722B (en) | 2024-06-04 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111423076.1A Active CN113927722B (en) | 2021-11-26 | 2021-11-26 | Complete equipment for mechanized flow production of small-sized concrete prefabricated parts |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113927722B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105401958A (en) * | 2015-11-18 | 2016-03-16 | 成都华川公路建设集团有限公司 | Prefabricating construction method with movable prefabricating trolley for tunnel cable trench cover plate |
| CN205130082U (en) * | 2015-11-26 | 2016-04-06 | 黑龙江省龙建路桥第三工程有限公司 | Small -size prefabricated section platform that vibrates |
| CN206144161U (en) * | 2016-08-31 | 2017-05-03 | 中冶天工集团有限公司 | Equipment of pouring little component concrete is exclusively used in |
| CN206748675U (en) * | 2017-04-27 | 2017-12-15 | 中铁十一局集团第二工程有限公司 | A kind of small-sized prefabricated member processing unit (plant) |
| CN206982969U (en) * | 2017-07-20 | 2018-02-09 | 中铁三局集团有限公司 | Automatic storage, transport, pour, the complete set of equipments of vibrated concrete |
| CN108501174A (en) * | 2018-03-12 | 2018-09-07 | 中国葛洲坝集团第工程有限公司 | Protection prefabricated section numerical control cloth vibrates integrated apparatus and construction method |
| CN216329076U (en) * | 2021-11-26 | 2022-04-19 | 中国二十二冶集团有限公司 | Small-sized concrete prefabricated member mechanized flow production complete equipment |
-
2021
- 2021-11-26 CN CN202111423076.1A patent/CN113927722B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105401958A (en) * | 2015-11-18 | 2016-03-16 | 成都华川公路建设集团有限公司 | Prefabricating construction method with movable prefabricating trolley for tunnel cable trench cover plate |
| CN205130082U (en) * | 2015-11-26 | 2016-04-06 | 黑龙江省龙建路桥第三工程有限公司 | Small -size prefabricated section platform that vibrates |
| CN206144161U (en) * | 2016-08-31 | 2017-05-03 | 中冶天工集团有限公司 | Equipment of pouring little component concrete is exclusively used in |
| CN206748675U (en) * | 2017-04-27 | 2017-12-15 | 中铁十一局集团第二工程有限公司 | A kind of small-sized prefabricated member processing unit (plant) |
| CN206982969U (en) * | 2017-07-20 | 2018-02-09 | 中铁三局集团有限公司 | Automatic storage, transport, pour, the complete set of equipments of vibrated concrete |
| CN108501174A (en) * | 2018-03-12 | 2018-09-07 | 中国葛洲坝集团第工程有限公司 | Protection prefabricated section numerical control cloth vibrates integrated apparatus and construction method |
| CN216329076U (en) * | 2021-11-26 | 2022-04-19 | 中国二十二冶集团有限公司 | Small-sized concrete prefabricated member mechanized flow production complete equipment |
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| Publication number | Publication date |
|---|---|
| CN113927722A (en) | 2022-01-14 |
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